error java.io.filenotfoundexception tessdata/eng.traineddata

Solution:-
   Create a folder named tessdata inside assets android\app\src\main\assets
   Download eng.traineddata file from https://github.com/tesseract-ocr/tessdata
   remember only to download eng.traineddata only not all of them.
     
   After downloading paste it inside tessdata (i.e android\app\src\main\assets\tessdata)